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- W158656803 abstract "I discuss how to obtain angular decay distributions for sequential cascade decays using helicity methods. The angular decay distributions follow from a reasonably simple master formula involving bilinear forms of helicity amplitudes and Wigner’s d functions. I discuss in some detail the issue of gauge invariance for off-shell gauge bosons. As a technical exercise I calculate the linear relation between the helicity amplitudes and the invariant amplitudes of semileptonic and rare baryon decays. I discuss two explicit examples of angular decay distributions for (i) the decay t → b + W(→ l+νl) (which leads to the notion of the helicity fractions of the W), and (ii) the sequential decay Λb → Λ(→ pπ−) + J/ψ(→ ll)." @default.
- W158656803 created "2016-06-24" @default.
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- W158656803 date "2014-02-12" @default.
- W158656803 modified "2023-09-23" @default.
- W158656803 title "Helicity Amplitudes and Angular Decay Distributions" @default.
- W158656803 doi "https://doi.org/10.3204/desy-proc-2013-03/koerner" @default.
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